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參數(shù)資料
| 型號(hào)： | LMH6639MAX |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 運(yùn)算放大器 |
| 英文描述： | 190MHz Rail-to-Rail Output Amplifier with Disable |
| 中文描述： | OP-AMP, 7000 uV OFFSET-MAX, 90 MHz BAND WIDTH, PDSO8 |
| 封裝： | SOIC-8 |
| 文件頁(yè)數(shù)： | 15/17頁(yè) |
| 文件大?。?/td> | 649K |
| 代理商： | LMH6639MAX |
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Application Notes
(Continued)
LMH6639’s shutdown pin can also be easily controlled in
applications where the analog and digital sections are oper-
ated at different supplies.
Figure 6
shows a configuration
where a logic output, SD, can turn the LMH6639 on and off,
independent of what supplies are used for the analog and
the digital sections:
The LMH6639 has an internal pull-up resistor on SD such
that if left un-connected, the device will be in normal opera-
tion. Therefore, no pull-up resistor is needed on this pin.
Another common application is where the transistor in
Figure
6
above, would be internal to an open collector (open drain)
logic gate; the basic connections will remain the same as
shown.
PCB LAYOUT CONSIDERATION AND COMPONENTS
SELECTION
Care should be taken while placing components on a PCB.
All standard rules should be followed especially the ones for
high frequency and/ or high gain designs. Input and output
pins should be separated to reduce cross-talk, especially
under high gain conditions. A groundplane will be helpful to
avoid oscillations. In addition, a ground plane can be used to
create micro-strip transmission lines for matching purposes.
Power supply, as well as shutdown pin de-coupling will
reduce cross-talk and chances of oscillations.
Another important parameter in working with high speed
amplifiers is the component values selection. Choosing high
value resistances reduces the cut-off frequency because of
the influence of parasitic capacitances. On the other hand
choosing the resistor values too low could "load down" the
nodes and will contribute to higher overall power dissipation.
Keeping resistor values at several hundreds of ohms up to
several k
will offer good performance.
National Semiconductor suggests the following evaluation
boards as a guide for high frequency layout and as an aid in
device testing and characterization:
Device
Package
Evaluation
Board PN
CLC730027
CLC730116
LMH6639MA
LMH6639MF
8-Pin SOIC
SOT23-6
These free evaluation boards are shipped when a device
sample request is placed with National Semiconductor. For
normal operation, tie the SD pin to V
+
.
20030273
FIGURE 6. Shutdown Interface (Single Supply, Open
Collector Logic)
L
www.national.com
15
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LMH6639MAX/NOPB | 功能描述:運(yùn)算放大器 - 運(yùn)放 RoHS:否 制造商:STMicroelectronics 通道數(shù)量:4 共模抑制比（最小值）:63 dB 輸入補(bǔ)償電壓:1 mV 輸入偏流（最大值）:10 pA 工作電源電壓:2.7 V to 5.5 V 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-16 轉(zhuǎn)換速度:0.89 V/us 關(guān)閉:No 輸出電流:55 mA 最大工作溫度:+ 125 C 封裝:Reel |
| LMH6639MF | 功能描述:運(yùn)算放大器 - 運(yùn)放 RoHS:否 制造商:STMicroelectronics 通道數(shù)量:4 共模抑制比（最小值）:63 dB 輸入補(bǔ)償電壓:1 mV 輸入偏流（最大值）:10 pA 工作電源電壓:2.7 V to 5.5 V 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-16 轉(zhuǎn)換速度:0.89 V/us 關(guān)閉:No 輸出電流:55 mA 最大工作溫度:+ 125 C 封裝:Reel |
| LMH6639MF/NOPB | 功能描述:運(yùn)算放大器 - 運(yùn)放 190MHZ RRO AMP W/ DISABLE RoHS:否 制造商:STMicroelectronics 通道數(shù)量:4 共模抑制比（最小值）:63 dB 輸入補(bǔ)償電壓:1 mV 輸入偏流（最大值）:10 pA 工作電源電壓:2.7 V to 5.5 V 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-16 轉(zhuǎn)換速度:0.89 V/us 關(guān)閉:No 輸出電流:55 mA 最大工作溫度:+ 125 C 封裝:Reel |
| LMH6639MFX | 功能描述:運(yùn)算放大器 - 運(yùn)放 RoHS:否 制造商:STMicroelectronics 通道數(shù)量:4 共模抑制比（最小值）:63 dB 輸入補(bǔ)償電壓:1 mV 輸入偏流（最大值）:10 pA 工作電源電壓:2.7 V to 5.5 V 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-16 轉(zhuǎn)換速度:0.89 V/us 關(guān)閉:No 輸出電流:55 mA 最大工作溫度:+ 125 C 封裝:Reel |
| LMH6639MFX/NOPB | 功能描述:運(yùn)算放大器 - 運(yùn)放 RoHS:否 制造商:STMicroelectronics 通道數(shù)量:4 共模抑制比（最小值）:63 dB 輸入補(bǔ)償電壓:1 mV 輸入偏流（最大值）:10 pA 工作電源電壓:2.7 V to 5.5 V 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-16 轉(zhuǎn)換速度:0.89 V/us 關(guān)閉:No 輸出電流:55 mA 最大工作溫度:+ 125 C 封裝:Reel |
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